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# Rectangular hyperbola coordinates watch

1. Going through FP1 really quickly for the first time on me ones so idk whether I'm being stupid or if the textbook has a misprint

Parametrics given as X=ct and y=c/t so standard coordinates should be P(ct,c/t) right? The book says P(ct^2,c/t) and continues to use it within examples?
2. (Original post by RonnieRJ)
Going through FP1 really quickly for the first time on me ones so idk whether I'm being stupid or if the textbook has a misprint

Parametrics given as X=ct and y=c/t so standard coordinates should be P(ct,c/t) right? The book says P(ct^2,c/t) and continues to use it within examples?
Can you post a photo?
3. (Original post by BarryBeTrippin)
Can you post a photo?

Am I being stupid and missing something?
I was thinking its a misprint cause last chapter is parabolas where X=at^2?
4. (Original post by RonnieRJ)

Am I being stupid and missing something?
I was thinking its a misprint cause last chapter is parabolas where X=at^2?
Yeah it's an error my book has the coordinates at (ct, c/t)
5. (Original post by BarryBeTrippin)
Yeah it's an error my book has the coordinates at (ct, c/t)
Ah ok thank youuu
6. (Original post by RonnieRJ)
Going through FP1 really quickly for the first time on me ones so idk whether I'm being stupid or if the textbook has a misprint

Parametrics given as X=ct and y=c/t so standard coordinates should be P(ct,c/t) right? The book says P(ct^2,c/t) and continues to use it within examples?
Mistake in the textbook, a quick check in your formula booklet will confirm this.
7. (Original post by RonnieRJ)

Am I being stupid and missing something?
I was thinking its a misprint cause last chapter is parabolas where X=at^2?
You're right - it's ct, not ct^2.
8. (Original post by Zacken)
Mistake in the textbook, a quick check in your formula booklet will confirm this.
Ooh didn't realise this was given in the formula booklet

Thank you!
9. Lol are u working on the floor??
10. (Original post by RonnieRJ)

Am I being stupid and missing something?
I was thinking its a misprint cause last chapter is parabolas where X=at^2?
You have to trust your judgement on this - you want a cartesian equation xy = c^2 and the book's version doesn't work with the coordinates they've given so you are right
11. (Original post by davros)
You have to trust your judgement on this - you want a cartesian equation xy = c^2 and the book's version doesn't work with the coordinates they've given so you are right
Yeah I checked it with the Cartesian form but then I wondered if the equation they gave was wrong!

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